Rowe admits that he initially failed to recognise the singer after he humbly said he played in a "local rock band" and, upon discovering that he was in Metallica, then mistook Hetfield for his drummer bandmate, Ulrich.

In his Facebook post, Rowe says he's usually good at remembering people's names - but blames his social faux pas on drinking mimosas in warm weather and failing to control his excited dog during the "botched encounter."

He says: "Thank you for being so gracious and saying such kind things about my foundation. I was very flattered. I also wish to apologies - not just for failing to recognize you - but for not recognizing you in front of your charming niece from Buenos Aires.

"It must have been very strange for her to watch her uncle - one of the greatest singers in the history of rock and roll - introduce himself to a guy with a psychopathic dog and no idea who he was. And it must have been especially gratifying for you, when I tried to recover by calling you Lars Ulrich - the first named that popped into my head when my synapses started firing off bad information." Read more - here.

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